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x in (-oo:+oo)
(3*x)/5 = 8/9 // - 8/9
(3*x)/5-(8/9) = 0
(3*x)/5-8/9 = 0
3/5*x-8/9 = 0 // + 8/9
3/5*x = 8/9 // : 3/5
x = 8/9/3/5
x = 40/27
x = 40/27
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